IT Support Playbooks / IT Support Guides
Troubleshoot by changing one variable at a time
Changing DNS, drivers and application settings together can hide which action helped and make rollback difficult. Use a small reproducible test and preserve a baseline.
Environment and inputs: Everyday IT support · Windows PowerShell examples unless specified
Try the diagnostic command
Use the stated shell and platform. Replace sample domains, addresses, services and paths with values from the system you are authorized to support.
Get-NetIPConfigurationHow to read the result
For a Windows networking case, this PowerShell command captures interface, address and gateway information before an approved change. Choose an equivalent read-only baseline for another kind of incident.
What to do next
Write down a hypothesis and expected result, make one authorized adjustment, and repeat the same test. Record the outcome and restore the baseline if the change did not help.
Before you make a change
A baseline can contain internal addresses. Do not perform an experimental production change simply because the command used to collect the baseline is read-only.